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Official Journal of the Japan Wood Research Society

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Effect of polyol on thermo-oxidative degradation of isocyanate resin for wood adhesives

Abstract

The thermo-oxidative degradation of various polyol-added isocyanate resins for wood adhesives was studied using differential scanning calorimetry and thermogravimetry. The degradation of the resin cured with water began at 150°C. When a certain polyol was added to the resin at an NCO/OH ratio of 25 in addition to water, the cured resin began to degrade at 200°C. To clarify the cause of the good thermal stability in polyol-added resins, the effect of various polyols on the reactivity of isocyanate was investigated. It was found that the reactivity of isocyanate was enhanced by the addition of a dipropylene glycol and glycerin-type polyols. In addition, the effect of the NCO/ polyol-OH ratio was investigated using dipropylene glycoltype polyol. The reactivity of isocyanate increased with increasing polyol content. The thermal stability of the resin was improved to a certain degree by addition of a small amount of the polyol but deteriorated when a large amount of the polyol was added.

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Correspondence to Kenji Umemura.

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Umemura, K., Kawai, S. Effect of polyol on thermo-oxidative degradation of isocyanate resin for wood adhesives. J Wood Sci 48, 25–31 (2002). https://doi.org/10.1007/BF00766234

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  • DOI: https://doi.org/10.1007/BF00766234

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